JPH0654649U - A device to prevent two sheets from sticking out - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object of the present invention to provide a device which has a simple structure and which prevents feeding of two plate-like objects and which can be easily adjusted. A stacking prevention device for stacking two plate-like objects (S) comprises a stocker (1) for stacking plate-like objects (S), and a feed-out direction of a plane including the plate-like objects (S) from the stocker (1). Conveying means (4, 5, 5) for sucking and conveying the plate-like material (S)
10) and two sheets which are fixedly arranged near the stocker (1) in the sheet feeding direction facing the conveying means (4) and are set to have a weaker suction force than the conveying means (4). It is composed of preventive suction means (20, 21).

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention, when sucking and pulling out a plate-like object laminated on a stocker, for example, a bag, when two sheets are drawn out in a stack for some reason, one sheet is blocked and the other one sheet is removed. The present invention relates to a device for preventing two stacked plate-like objects from being drawn out.

[0002]

[Prior art]

 In the present specification, the plate-like material refers to a relatively thin and flexible or flexible material such as a packaging bag, polyethylene sheet, paper and the like. As a feeding device that sucks and conveys plate-like objects in a plane-feeding direction including a plate-like object from a stocker in which the plate-like objects are stacked, for example, (1) Japanese Utility Model Laid-Open No. 56-38008 can be used. , The vacuum suction cup placed at the front of the bottom of the stocker adsorbs the lowest bag and pulls it downwards, and at the same time, it is sent out by the delivery belt conveyor arranged so as to close the bottom of the stocker and is in front of it. (2) As seen in Japanese Utility Model Laid-Open No. 58-60632, a suction mechanism is attached to the link mechanism arranged on the side of the stocker and the sheet is sucked by the suction mechanism, and the link mechanism is used. There are some that were moved by.

[0003]

[Problems to be solved by the device]

 In any of the feeding devices, when the plate-shaped object is pulled out from the stocker by the suction cup, the two plate-shaped objects are stacked in a stack due to some cause such as static electricity between the plate-shaped objects, frictional force or adhesion of sticky substances. However, no measures have been taken against it. Therefore, if the plate-shaped object is a bag and two sheets are unwound at one time, the other unbound bag may fall into the device and cause a malfunction, or label labeling. There is a problem that it may cause trouble or that opening may not be successful during filling. In an apparatus having another structure, for example, an apparatus in which a bag body is moved in parallel and taken out as shown in JP-A-59-174423, when the bag body is taken out from the stocker with a suction cup, two sheets are not stacked. In this way, pressurized air is blown between the first and second sheets with a nozzle to separate them, but in the feeding device where the feeding direction is within the plane containing the bag, this It is difficult to adopt the method. Moreover, even if it could be adopted, the above method is quite difficult to adjust because the movement of the suction cup is quite complicated in order to reliably prevent the two sheets from overlapping. Therefore, an object of the present invention is to provide a device that has a simple structure and prevents the two-sheet feeding, and that is easy to adjust.

[0004]

[Means for Solving the Problems]

 A stacking prevention apparatus for stacking two plate-like objects to achieve the above-mentioned object is a stocker for stacking plate-like objects and a plate-like object is sucked and conveyed from the stocker in a drawing-out direction of a plane substantially including the plate-like objects. Consists of a conveying means and a two-sheet stacking-preventing suction means which is fixedly arranged near the stocker facing the conveying means in the sheet feeding direction and has a suction force set to be weaker than that of the conveying means. . The present invention can be used not only to take out a plate-like object from the bottom of the stocker or obliquely below as disclosed in Japanese Utility Model Publication No. 56-38008 and 58-60632, but also to take out a plate-like object from the side of the stocker. Applicable. Also, when taking out from below, even if the plate-like object is not sucked directly with a suction cup, for example, fix the suction cup or suction chamber directly below the stocker take-out port, and prevent suction between the stocker and the suction cup or suction chamber. Not possible The transport belt may be run so that the plate-like object sucked by the suction cup or the suction chamber is transported by the transport belt. The two-layer stacking-preventing suction means may be hollow and have a plurality of holes for sucking the plate-like object on the side for sucking one of the two stacks. If there is a considerable frictional force between the second plate-like object sucked by the double-sheet stacking suction device and the first plate-like object carried by the conveying device, In this case, the fixed nozzle may be arranged diagonally from the front to the rear between the first and second sheets. The frictional force may be reduced by blowing air from this nozzle.

If two sheet-shaped materials are delivered from the stocker by the transport means, the second sheet is separated from the first sheet because the second sheet is sucked by the stacking-preventing suction means and stays at that position. When the first sheet has been conveyed, the conveying means returns to the stocker position to try to suck the plate-like object in the stocker, but the second plate-like object sucked by the two-sheet stacking suctioning means causes the stocker to move. The suction of the plate-like material inside is hindered. Since the suction force of the conveying means is set stronger than the suction force of the two-sheet stacking prevention suction means, the second plate-like object sucked by the two-sheet stacking prevention suction means is scraped off and conveyed. When two-sheet feeding is performed, this process is repeated, so that the two-sheet feeding can be prevented with a simple structure. Further, the adjustment is easy because the suction force can be adjusted.

[0005]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. First, referring to FIG. 1, reference numeral 1 is a stocker for stacking and accommodating plate-like objects S. The stocker 1 is configured such that the adjusting gate 2 at the rear can be moved in the front-rear direction so that the plate-like object S to be accommodated can be sufficiently accommodated even if the length thereof changes. The stocker 1 is provided with a take-out port 3 for taking out the plate-like objects S one by one at the bottom portion on the side opposite to the adjusting gate 2. Immediately below the take-out port 3, there is arranged a carrying means 4 having a width substantially the same as the width of the take-out port 3 for sending the plate-like object S to the front of the stocker 1 as it is. The transfer means 4 is mainly composed of a vacuum chamber 5 and a transfer belt 10. The vacuum chamber 5 is arranged on the back side of the conveyor belt 10 and the opening of the vacuum chamber 5 is directed upward in order to suck the plate-like object S across the conveyor belt 10. The size of the opening is almost the same as the size of the outlet 3, but the opening is located slightly above the front plate of the stocker 1 in front of the middle point of the outlet 3. A hose 6 is connected to the vacuum chamber 5 as shown in FIG. A vacuum source connected to the vacuum chamber 5 through the hose 6 is not shown, but a blower, a vacuum pump or a vacuum generator can be used, preferably a blower capable of producing a large amount of air is used. Is desirable. The conveyor belt 10 is wound around a belt wheel 11 and circulates from the outlet 3 toward the outlet, but the conveyor belt 10 used here does not hinder the suction force of the vacuum chamber 5, Moreover, any material may be used as long as it has a function of allowing only air to pass and not allowing the plate-like material S to pass. FIG. 2 shows an example of this.

The conveyor belt 10A shown in FIG. 2 is configured such that the feeding speed can be freely changed only by the belt speed. The belt 10A has an L region having many holes 12 and a P region having no holes. They are arranged alternately. However, holes are omitted in the lower belt. The size and the position and the number of the holes 12 in the L region are set according to the opening of the vacuum chamber 5 and the size of the suction force. The P region is provided to block the suction force of the vacuum chamber 5 so that the supply source to the vacuum chamber 5 does not have to be cut off, and the length of L + P is naturally larger than the length of the plate-like object. Has been done. In addition, what is arranged in front of the adjusting gate 2 in contact with the conveyor belt 10 in FIG. 1 is a pressing roller 13 for preventing the plate-like object S conveyed by the conveyor belt 10 from floating. The feeding speed of the plate-like object S is adjusted by changing the speed of one of the belt pulleys 11. However, if it is too fast, the suction force may be insufficient, so at that time, the suction force of the vacuum source is increased. There is a need. This suction force can be adjusted not only by the vacuum source but also by changing the height of the stocker 1 or inclining it.

In the meantime, although it does not occur much, in the above-mentioned configuration, the plate-like object S is caught for some reason, for example, frictional force, electrostatic force, adhesion of sticky substances, or the like, and the two plate-like objects S are caught, and the transporting means is directly used. May be rolled out to 4. Even if the number is small, if such double-sheet feeding occurs, one of the double-layered sheets will drop in the middle, causing an unexpected failure, and problems such as unsuccessful labeling and opening of the bag. Therefore, it is better not to do this type of double feed. Therefore, in order to solve this kind of problem, the two-sheet stacking-up prevention suction means 20 faces the vacuum chamber 5 of the conveying means 4 immediately before the front plate of the stocker 1 and from the conveying belt 10 to the plate-like object S. It is placed about 2 sheets higher than the thickness. The two-sheet stacking-out prevention suction means 20 is configured to suck the plate-like object S on the upper side and temporarily prevent the progress thereof when the two plate-like objects S are stacked. is there. Therefore, as shown in FIG. 1, a plurality of suction holes 21 are provided on the bottom surface of the two-sheet stacking-up prevention suction means 20. The plurality of suction holes 21 are provided substantially at the center so as not to be affected even if the width of the plate-like object S is changed, but they may be provided at other places. Further, if the suction force of the two-sheet stack feeding prevention suction means 20 is stronger than the suction force of the vacuum chamber 5, the plate-like object S cannot be conveyed in the feeding direction. The suction force is weaker than the suction force of the vacuum chamber 5. Therefore, when the same vacuum source is used, a valve that restricts the flow rate is attached to the hose (not shown) connected to the double sheet feeding prevention suction means 20 to reduce the suction pressure, or suction is performed by another method. The pressure may be weakened. The double-sheet feeding prevention suction means 20 may be constantly sucking from the vacuum source, but may be controlled intermittently so as not to hinder the conveyance when energy saving is to be achieved as much as possible. Further, the bottom portion of the stacking prevention suction means 20 on the stocker 1 side may be chamfered so that the stack S of two sheets can easily pass through.

Next, the operation will be described. When the position of the opening of the vacuum chamber 5 pulled by the vacuum source and the position of the hole 12 of the conveyor belt 10 rotating as shown by the arrow in the drawing match, the plate-like object S is sucked by the take-out port 3 and conveyed. It is paid out on the belt 10. Here, if the two plate-like objects S are taken out for some reason, the two upper plate-like objects S are attracted through the suction holes 21 of the stacking-preventing suction means 20 and their progress is blocked. It is separated from the plate-like object S on the side of the conveyor belt 10. When the lower plate-like object S passes through the conveying belt 10 and the two stacking-out prevention suction means 20, the next hole 12 of the conveying belt 10 appears above the opening of the vacuum chamber 5. Since the take-out port 3 is closed by the above-mentioned plate-like object S sucked by the two-sheet feeding-out preventing suction means 20, two new sheet-like objects S are taken out from the stocker 1 without being taken out. The plate-like object S sucked by the prevention suction means 20 is sucked by the vacuum chamber 5 having a strong suction force and conveyed in the feeding direction, and the double feeding is prevented. After that, normal feeding is performed, but when two sheets are stacked, the above process is repeated. In the process of stacking two sheets, the leading position of the second sheet comes out before the front plate of the stocker 1, but the position shift is slight and does not affect the subsequent processing. However, if it is necessary to correct the positional deviation, a position-adjusting transport belt may be further provided in front of the transport belt 10 to adjust the position.

In the above-mentioned embodiment, the transport belt is intermittently perforated to suck the plate-like object. Instead of this, as shown in FIG. 3 or 4, the plate-like object is intermittently sucked. You may send it to. In FIG. 3, the vacuum chamber 5 is intermittently evacuated to suck the plate-like object S. In this case, since it is not necessary to provide a blocking area on the belt, the width and the length of the conveyor belt 10B are reduced. A large number of holes 12 are regularly formed in the depth direction. Although not shown in the figure, the lower belt also has many holes. A rotary valve 15 is attached between the vacuum chamber 5 and the vacuum source in order to intermittently evacuate the vacuum chamber 5. Although not shown, a controllable motor is attached to the rotary shaft of the rotary valve 15. In this example, the feeding speed of the plate-like object S depends on the angular velocity of the rotary shaft of the rotary valve 15. However, if the angular velocity is increased, the belt speed must be increased. Therefore, the feeding speed can be adjusted by adjusting the belt speed and the rotary valve. This is done by changing both the angular velocities of the 15 rotation axes. Although the holes 12 are regularly formed in the conveyor belt 10B in the illustrated example, the holes are not limited to these and may be random holes, and a mesh belt or a rope belt may be used instead. Good. The operation of preventing the two-sheet feeding is the same as that of the above-mentioned embodiment.

FIG. 4 is a modified example of FIG. 3, in which the rotary member 16 incorporated in the vacuum chamber 5B has holes 17 formed in one or several rows in the longitudinal direction to form the rotary valve of FIG. It has the same function as 15. The right end of the rotary member 16 is connected to a vacuum source via a swivel joint, not shown, and the left end is connected to a controllable motor, also not shown. The adjustment of the feeding speed is exactly the same as in FIG. 3, and the operation for preventing the feeding of two sheets is also the same.

As described above, as an embodiment of the present invention, the case where the plate-like material is exclusively drawn out from under the stocker has been described, but the present invention is not limited to this, and when it is taken out from the side of the stocker. Can also be applied. Further, the conveying means is not limited to the above embodiment, and may be the one disclosed in, for example, Japanese Utility Model Publication No. 56-38008 and Japanese Utility Model Publication No. 58-60632.

[0012]

[Effect of device]

 As described above, according to the present invention, it is possible to prevent the two plate-like objects from being fed out with a simple structure, and the adjustment thereof is easy.

[Brief description of drawings]

FIG. 1 is a side view showing a partial cross-section of an embodiment of the present invention.

FIG. 2 is a perspective view of the conveyor belt used in FIG. 1 (however, the hole of the lower belt is omitted).

FIG. 3 is a perspective view showing a conveyor belt used in FIG. 1 (holes in the lower belt are omitted as in FIG. 2) and a vacuum system suitable for the belt structure.

4 is a perspective view showing a configuration of a vacuum chamber used in place of the vacuum system of FIG.

[Explanation of symbols]

 1 stocker 2 adjustment gate 3 take-out port 4 transfer means 5, 5B vacuum chamber 6 hoses 10, 10A, 10B transfer belt 11 belt wheel 12, 17 hole 13 pressing roller 15 rotary valve 16 rotating body 20 2 sheets stacking prevention suction means 21 Suction hole

Claims (1)

[Scope of utility model registration request] 1. A stocker for stacking plate-like objects, a transport means for sucking and transporting the plate-like objects in a feeding direction of a plane substantially including the plate-like objects from the stocker, and a plate-like member facing the transport means. A two-sheet stacking-up prevention device for plate-like materials, comprising a two-sheet stacking-preventing suction means fixedly arranged near the stocker in the article-sending direction and having a suction force weaker than that of the transporting means.